608981814043domain: NAppears in sequencesPrimes p such that the number of primes q, 5 <= q < p, congruent to 1 mod 3, is equal to the number of such primes congruent to 2 mod 3.at n=20A096449Primes p such that Pi_{3,1}(p) = Pi_{3,2}(p), where Pi_{m,n}(p) denotes the number of primes q <= p with q == n (mod m).at n=9A392294